Posted By: cole63b
360 horsepower - 10/31/10 02:06 AM
I have a 360 bored 60 over, x heads with 3 angle valve job, 508 lift hydraulic cam, 650 double pumper carb. anyone know about what kind of horsepower ill have out of this. thanks
360 horsepower
Posted By: goldmember
Re: 360 horsepower - 10/31/10 02:28 AM
350ish. Stock type piston?
Posted By: GO_Fish
Re: 360 horsepower - 10/31/10 04:29 AM
What compression ratio, that is critical (to guess is pretty useless, has to be measured to accurately figure horsepower). If you have stock style dished pistons, close to .10 below deck, your compression ratio will be about 8:1 at best, and your hp would be 330 or 340 hp.
Posted By: RapidRobert
Re: 360 horsepower - 10/31/10 07:33 AM
low 300's
Posted By: 2boltmain
Re: 360 horsepower - 10/31/10 06:01 PM
His info is vague AND I am not an engine builder but my observations: Lets assume the OP engine is using the oem pistons. They will be really low on compression. Then that engine has a really large cam. (508 lift...235ish deg @.050??) If this is accurate this would make for a real slug of an engine. I cant imagine such an engine out running the 1972 340 magnum which was 8.5:1 and rated at 240hp. My 360 will have KB107 pistons, OEM LA heads and an Engle 230 degree cam. I will be happy with 350 crank hp. 
Posted By: goldmember
Re: 360 horsepower - 10/31/10 06:22 PM
You are dead on that the info given is vague. The potential low compression will kill the bottom end and make a pooch out of it,with enough converter and gear it may run well enough for the op. That cam is close to 250@.050 and very long seat to seat. Yes, I have run combos like this 20plus years ago and they are not close to ideal.
Posted By: Paul_Fancsali
Re: 360 horsepower - 11/01/10 04:47 PM
I'm big on 360s but if that is a stock comp engine as stated it will be a dog. Horsepower roughly 250-280 maybe, decent comp and good stall and or stick it maybe a real good runner. That cam is too outdated to be a real runner compared to the new one out there, I know I ran one for close to 20 years a Racer brown model great with 11.0 comp but still a real dog down low. Stick 4.10s but great mid range and top end. With a lot milder cam I have both low and top end and a good idel to boot, Byb the way thay cam is a gas hog
Posted By: MoparforLife
Re: 360 horsepower - 11/01/10 05:48 PM
So many here seem to under estimate the output of the 360 and I don't know why. My own experience and that of others around here find that it really don't take much to really wake them up even with stock type pistons. The last one I built was .030 over with 485/495 cam with 271/284 advertised duration, 750 Holley and 4.30 gear and 29.5 slick and it would run low 12's all day in the Duster. Many of us have built many of these engines and found like I said it don't take much even with stock pistons. Lotsa low buck builds around that would surprise a lot of you. Both big and small block. 
Posted By: patrick
Re: 360 horsepower - 11/01/10 06:52 PM
Quote:
So many here seem to under estimate the output of the 360 and I don't know why. My own experience and that of others around here find that it really don't take much to really wake them up even with stock type pistons. The last one I built was .030 over with 485/495 cam with 271/284 advertised duration, 750 Holley and 4.30 gear and 29.5 slick and it would run low 12's all day in the Duster. Many of us have built many of these engines and found like I said it don't take much even with stock pistons. Lotsa low buck builds around that would surprise a lot of you. Both big and small block.
but I also think a 509 is way too big with that low of compression. headers, an LD340/RPM/air gap intake,a 750-800cfm carb, a good valve job, and something like a comp XE268 will be an honest 340-350ish HP. with the low compression, it'll be soft on the bottom end, and will probably want a 3000 RPM stall converter to really wake up.
Posted By: goldmember
Re: 360 horsepower - 11/01/10 07:32 PM
Lot's of ways to skin a cat folks. At 3200lbs it only takes 350hp to run 12.00's at 110mph. It's been done a thousand different ways. I've run low 12's with a comp 268he and a MP .509 in the same combo. One wanted more converter and gear to run mid 11's.
Posted By: MoparforLife
Re: 360 horsepower - 11/01/10 08:15 PM
I was running an out of the box stock LD4B at the time. Stock heads with no porting or gasket matching done.
Posted By: 2boltmain
Re: 360 horsepower - 11/01/10 09:06 PM
I dont think members are being negative or underestimating the 360- We are simply pointing out what prevents any engine by any manufacturer from making impressive power- pistons too far down at TDC! A 360 400 and 440 is soooo far from its potential and so not ideal with those smog era pistons. I understand if one has to run what they got though. If it were me Id have the engine add ons based around those low comp pistons- RV torque cam, stock 4bbl (Performer/Action Plus) intake headers turbo mufflers- ect.
Posted By: MoparforLife
Re: 360 horsepower - 11/01/10 09:27 PM
I am a firm believer that if the 360 had been introduced in '68' rather than the 340 and built to 340 type specs the tables would have been turned. 
Built and seen built many 360 with stock dished pistons small 265 470ish & lift cams & 1.88 valve heads, (2.02 didn't do a thing in our trials in fact the 1.88 gave/gives more low end) cars in full street trim with 3.91 gears run at least a half second quicker than the stock 340's of the era. (By the way I was there and owned them)
Built and seen built many 360 with stock dished pistons small 265 470ish & lift cams & 1.88 valve heads, (2.02 didn't do a thing in our trials in fact the 1.88 gave/gives more low end) cars in full street trim with 3.91 gears run at least a half second quicker than the stock 340's of the era. (By the way I was there and owned them)
Posted By: 2boltmain
Re: 360 horsepower - 11/01/10 09:42 PM
A few years ago I pondered if I really needed new pistons for my 360 project. Id like an honest 350-370 crank hp. I read that many achieved this power level with oem smogger pistons. In the end I did buy a new set of KB107s. They are advertised as a 10:1 piston. I paid $150 for them- brand new but from a moparts member who changed projects. I know the 275hp 340 ran so much harder than the 360 that replaced it and the most significant difference was the piston height.
Posted By: dgc333
Re: 360 horsepower - 11/03/10 01:08 PM
Just add a point of reference to this discussion. My 360 is 30 over with zero decked KB107 pistons. I have stock magnum heads and run a Comp XE268H cam (224/230 @ 50, .509/.512 lift with the magnum 1.6 rockers). I have a high rise dual plane intake, 600 CFM vac secondary holley, 1 5/8 headers, A833OD and 3.55 gears.
This combo is making approximatley 370 HP based on 102 mph trap speed.
This combo is making approximatley 370 HP based on 102 mph trap speed.
Posted By: 2boltmain
Re: 360 horsepower - 11/03/10 09:11 PM
Quote:This is encouraging for me and my future 360 build. This project of mine is at least 3 years away yet and I really hope to be able to buy the EQ Magnum type heads or the Hughes Magnum type heads. Under my bed I have new KB107s, an Engle cam 230 dur 510 lift and a new Offenhauser 2 x 4 underhood dual 4bbl intake.
Just add a point of reference to this discussion. My 360 is 30 over with zero decked KB107 pistons. I have stock magnum heads and run a Comp XE268H cam (224/230 @ 50, .509/.512 lift with the magnum 1.6 rockers). I have a high rise dual plane intake, 600 CFM vac secondary holley, 1 5/8 headers, A833OD and 3.55 gears.
This combo is making approximatley 370 HP based on 102 mph trap speed.
Posted By: feets
Re: 360 horsepower - 11/03/10 10:03 PM
Quote:
Just add a point of reference to this discussion. My 360 is 30 over with . I have stock magnum heads and run a Comp XE268H cam (224/230 @ 50, .509/.512 lift with the magnum 1.6 rockers). I have a high rise dual plane intake, 600 CFM vac secondary holley, 1 5/8 headers, A833OD and 3.55 gears.
This combo is making approximatley 370 HP based on 102 mph trap speed.
The key phrase: zero decked KB107 pistons
That makes all the difference.
If he's running a 509 cam and low compression, it's going to be a PIG. Without compression and a matching intake that cam won't do anything but make him beat his head against the wall.
I remember running a MP 509 cam in my 8:1 440 with a Performer intake. It was horrible. The car had trouble doing a burnout with the stock converter. Once the engine was over 3000 rpm it would start to pull. The intake held it back on the top end.
Posted By: goldmember
Re: 360 horsepower - 11/03/10 10:50 PM
Unless that Abody weights 4500lbs it should run alot more mph if it's making 370hp. When I ran 110mph@3100lbs with a 268he cam and pistons a mile in the hole I guessed it made 325hpish,seems close. what hp would it take to run 107mph @3500lbs? I'd guess 360ish? Maybe I need a better calc.
Posted By: Baxter61
Re: 360 horsepower - 11/03/10 11:15 PM
Quote:
Unless that Abody weights 4500lbs it should run alot more mph if it's making 370hp. When I ran [Email]110mph@3100lbs[/Email] with a 268he cam and pistons a mile in the hole I guessed it made 325hpish,seems close. what hp would it take to run 107mph @3500lbs? I'd guess 360ish? Maybe I need a better calc.
At 3500 lbs it takes close to if not over 400. I was running 103 at 3550 and according to the wallace calculator I was right at 360/370 if I remember correctly.
Posted By: DJVCuda
Re: 360 horsepower - 11/03/10 11:18 PM
on the dyno my 360 made 297 hp at the wheels and went 12.56 @106 - 108 was my best mph ever
small valve heads, air injection ports, with KB 107's and a mopar 474 cam
small valve heads, air injection ports, with KB 107's and a mopar 474 cam
Posted By: cole63b
Re: 360 horsepower - 12/02/10 03:37 AM
sorry i havent been on here in awhile everyone and im glad i seen all this info and yes the car does have kb107 pistons. and has a a833 4 speed transmission. so im guessing from what im seeing around 350-375 with just a guess. i just worked with what i had and acquired through some friends.